Carpal Tunnel Flashcards
What is the attachment of flexor retinaculum?
- Proximal: Pisiform, Tubercle of scaphoid
- Distal: Hook of hamate, Trapezium
What are the structures passing through carpal tunnel?
- 4 tendons of flexor digitorum superficialis
- 4 tendons of flexor digitorum profundus
- 1 tendon of flexor pollicis longus
- 1 tendon of flexor carpi radialis
- Median nerve.
How to test FDP?
By fixing the PIP
How to test FDS?
Adjacent digits must be held in extension, in order to eliminate FDP motion in adjacent fingers, which otherwise might give the impression of FDS motion in the examined finger
Where do the tendons of FDS and FDP insert?
- FDS: Split tendon on both sides of the middle phalanx
- FDP: Passes through the split tendon of FDS to be inserted into the terminal phalanx
Which tendon is attached to the Pisiform?
Flexor carpi ulnaris
What is the function of intertendinous connections?
- Create space between extensor tendons
- Redistribute force between tendons
- Coordinate extension of fingers
- Stabilize MCP joint
Identify the Red box structures
Identify the Green box structures
What are the two tendons inserted into the index finger?
- Extensor indicis (medial)
- Extensor digitorum (lateral)
Describe the origin, insertion, NS, & Action of the first dorsal interosseus?
- Origin: From the first metacarpal
- Insertion: Into the lateral side of extensor expansion of the index finger
- N. Supply: Deep branch of the ulnar nerve
- Action: Abduction of index finger
When you are doing a power grip of the hand, what is the role of the radial nerve?
The radial nerve supplies wrist extensors which give a mechanical advantage to power grip by synergistic activity which causes more efficient flexion of the digits
Why is hand grip more powerful in extension than flexion?
Because the flexor muscles in extension position are in a state of tension than in flexion position, contraction in this position is more powerful.
